You are full of it. Sever setup is not difficult. If you are kicking people trying to join, it looks suspicious as hell. It does not take 5 of the server admin's friends to test a server. Servers like this deserve to be blacklisted.
How exactly would a server admin do this? What kind of special powers do you think server admins have? This is a script exploit. You were killed by what people would call a "hacker" or "exploiter." It was another player that was currently on the server. It has been going on for a very long time.